What is 1 kilogram-force in newtons?

1 kgf equals exactly 9.80665 N. This derives from standard gravity (g = 9.80665 m/s²) — the force exerted by a 1 kg mass under standard gravitational acceleration.

Why is the conversion factor 9.80665 and not 9.81?

9.80665 m/s² is the internationally defined standard gravity (ISO 80000-3). Using 9.81 is a common engineering approximation; the exact value is 9.80665.

What is kilogram-force (kgf)?

Kilogram-force is a non-SI unit of force equal to the gravitational force exerted on a 1 kg mass at standard gravity. It is also written as kp (kilopond) in some European engineering contexts.

How do I convert newtons back to kilogram-force?

Divide the newton value by 9.80665. For example, 100 N ÷ 9.80665 ≈ 10.197 kgf. Use the Swap button on this page to do it automatically.

Is kgf the same as kg?

No. kg is a unit of mass; kgf is a unit of force. They are numerically equal only under standard gravity, which is why the distinction matters in physics and precise engineering.

Kilogram-force to Newtons Converter

Name: Kilogram-force to Newtons Converter
Availability: InStock
Author: Nham Vu

Enter a kilogram-force value and instantly get the equivalent in newtons using the exact factor 1 kgf = 9.80665 N.

Force Value

Kilogram-force (kgf)

Newtons (N)

Decimal places

Result

Enter a value to convert

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Conversion factor

1 kgf = 9.80665 N

Defined by standard gravity (ISO 80000-3)

Quick reference

kgf	N

Summary

Enter a kilogram-force value and instantly get the equivalent in newtons using the exact factor 1 kgf = 9.80665 N.

How it works

Enter a force value in kilogram-force (kgf) in the input field.
The converter multiplies your value by the exact factor 9.80665.
The result in newtons (N) appears instantly below.
Use the swap button to convert newtons back to kilogram-force.
Click Copy to copy the result to your clipboard.

Use cases

Convert spring or load ratings from kgf to SI newtons for engineering specs.
Check force values in physics homework or lab reports.
Translate legacy force measurements in kgf to newton-based design tools.
Verify tensile or compression test results expressed in kilogram-force.
Convert weight-based force readings from scales or load cells.
Cross-check catalog force specs between metric and SI systems.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu